Grooveduck itself seems to be popping

I opened up the help file for [grooveduck2] and loaded a simple test file I know to be clean. The ducking indeed avoids starting and ending pops, but there are some rather softer clicks occurring irregularly as the object plays back. These audio artifacts don’t happen when I load the same audio file with [play~] for instance. What’s happening here? Does anyone else have this issue?